If you are really using that old Firefox 6.0.1 version then you should update via Help > About Firefox.
*https://support.mozilla.org/kb/Finding+your+Firefox+version
*https://support.mozilla.org/kb/update-firefox-latest-version
See also:
*https://support.mozilla.org/kb/Websites+look+wrong
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Can you attach a screenshot?
*https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem
*http://en.wikipedia.org/wiki/Screenshot